bjoernager/rust
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Introduce UsageMap::user_map.

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`UsageMap` contains `used_map`, which maps from an item to the item it
uses. This commit add `user_map`, which is the inverse.

We already compute this inverse, but later on, and it is only held as a
local variable. Its simpler and nicer to put it next to `used_map`.
This commit is contained in:
Nicholas Nethercote 2023-06-01 13:00:06 +10:00
parent de2911f454
commit 5b0c56b333
2 changed files with 14 additions and 21 deletions
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11
compiler/rustc_monomorphize/src/partitioning.rs
View file

@ -514,15 +514,6 @@ fn internalize_symbols<'tcx>(
return;
}
// Build a map from every monomorphization to all the monomorphizations that
// reference it.
let mut user_map: FxHashMap<MonoItem<'tcx>, Vec<MonoItem<'tcx>>> = Default::default();
cx.usage_map.for_each_item_and_its_used_items(|user_item, used_items| {
for used_item in used_items {
user_map.entry(*used_item).or_default().push(user_item);
}
});
// For each internalization candidates in each codegen unit, check if it is
// used from outside its defining codegen unit.
for cgu in codegen_units {
@ -535,7 +526,7 @@ fn internalize_symbols<'tcx>(
}
debug_assert_eq!(mono_item_placements[item], home_cgu);
if let Some(user_items) = user_map.get(item) {
if let Some(user_items) = cx.usage_map.get_user_items(*item) {
if user_items
.iter()
.filter_map(|user_item| {